Improvement in eotaey pumps



@l-uiten tetrs gaten-r @fitta JAMES AMIRAX BAZIN, GANTGN, MASSACHUSETTS.

Letters Patent No. 65,992, dated Jil-ne 25, 1867.

IMPROVEMENT IN ROTARY PUMPS.'

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMES AMIRAUX BAZIN, of Canton, in the county of Norfolk, andState of Massachusetts, have invented certain Improvements iu Rotary Pumps and Engines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this speciiication, in which- Figure 1 is an elevation of a rotary pump of my improved construction, vthe front of the exterior of the casing being removedto show the parts within.

'Figure 2 is a central vertical section through the same.

Figure 3 is a. rear elevation of the outside ofthe pump representing the external gearing.

Figure 4 is a section ou the line :v a: of g. 2. i

In the rotary pump ofthe ordinary construction the water is drawn in at or near the bottom of the casing and discharged at or near its top, and foreign substances, such as small stones, etc., are frequently takenin and thrown over between the wings of the pistons, and thus destroy the pump. The form of these wings is such that when they come incontact with each other or the interior of the casing, the extent of the bearing surface between them is so small that when gritty substances are drawn into the pump they soon cause the parts to be worn away and the pump to leak, beside which, a portion of the water raised flows into thespace between the wings in contact and is carried back or returned to the bottom. Furthermore, the pistons of the pump above referred to are not packed in such manner that the surfaces between the wings will yield as required and still maintain a tightjoint, andthe casing of this pump-:has heretofore beenmade in one piece, by which construction, when the surfaces ofthe parts are worn away and the pump leaks, there is no possibility of repairing them. To remove the above-mentioned diiiiculties is the object of my improved pump.

My invention consists'iu the construction and arrangement of a spring-cushion for packing the pistons at the points between them Where there is the greatest diiliculty of maintaining close joints.

To enable others skilled in the art to understand and use my invention, Iwill proceed to describe the manner in which I have carried it out.

In the said drawings, A is the shell or casing, of metal or other suitable material, formed of two side-pieces, a, which enclose two central pieces, b, and when snugly fitted and secured together form a hollow chamber, B, the top of which communicates with a passage, C, through which the water is drawn into the pump, the water being discharged therefrom through the passage D at its bottom. E F are pistons placed upon the shafts Gr II, which have their bearings in and project outside of the casing A. I J are external gears, to which power is applied through the shafts to revolve the pistons when used for raising Water, the pistons being driven by steam applied directly to them when the apparatus is employed as a rotary engine. Ihese pistons are of the form shown in gs, 1 and 2, the curvature of the portion from 5 to G of the wings c corresponding to that from 'i' to 8 of the cogs d of the external gearing, (the degree of the curvature of this portion 5 to 6 approaching nearer to a radial line than would be the caseY were there a much greater number of cogs,)` the space occupied by each wing e being equal to that occupied by two cogs cZ and the space c between them, as seen in red, iig. I, the number and form ofthe wings being that best adapted to insure the wing of one piston snugly lling the space between two contiguous wings of the other piston, by which construction lnone of the water is carried back or returned to the top of the casing, and foreign substances that may enter are carried around inside and discharged at the the eduction-passage below, thus preventing any liability of breakage, which frequently occurs in the pump of the ordinary construction. In order to make as extended a bearing surface as possible between the pistons and the inside of the casing, I make the diameter of the outside of the wings c a little less than' the outside diameter of the cogs, and thereby avoid any sharp corners into -which gravel or dirt might otherwise collect, is a packing of rubber, sheet metal, or other suitable material, that possesses suicient elasticity to yield and expand as required, in order to maintain a tight joint at all times, the said rubber ,or elastic material being faced with a block of hard wood or other suitable material, so tted as to be easily slipped in front of the elastic material f. This hard surface, k, when brought in contact with the wing of the piston, presses upon the elasticf, which yields and expands, thereby maintaining a tight joint, while the hard surface protects the rubber or other elastic material from wear.

The mechanism above described may he use to advantage as a. fen-blower for creating :t drought, and may also be used as e water-meter, and if from any cause the interior surfaces become Worn so as to Cause leakage, the piece?J a 6 of the easing may be detached, and the surfaces in Contact from g to 11i, after being carefuliy pinned; may be reunited, 'when the bearing surfaces of the Wings ofthe pistons will snugly it the interior of the easing.

in the foregoing description I have referred to a certain xed proportion of the Coge ofthe external geering to the wings of the pistons, but es itis evinient that the number of @ogs teken, as the width of each wing must he one more than the number of spaces between the cogs, each wing must -consist of im odd number of equal divisions laid off on the pitch line of the oog-Wheel, and thus that the proportion between the coge and the wings may be a multiple of any other odd number, Without departing from the principle above stated.

What claim as my invention, and desire to secure by Let-ters Patent, is-

The paekingf r, construeted as described, and arranged between the Wings ofthe pistons, substantie-Uy as set forth.

JAMES AMIRAUX BAZIN. Witnesses:

N. W. STEARNS, P. E, TESCHEMAGHER. 

